No one can tell you her risk of being pregnant, it all depends on her cycle. The 'pull out method' is not considered to be an effective form of birth control. If you told your doctor that was how you were preventing pregnancy, he would probably tell you to plan on getting pregnant.
Get condoms. Wear condoms. They protect you from so much more than just pregnancy. There are a lot of diseases out there that you can't tell someone has just by looking. Be safe. Wear a raincoat. ;)
also, don't be freaking out right now. Wait until there is a reason to freak out. But first, go get some rubbers!